CN211180372U - Optical imaging lens - Google Patents
Optical imaging lens Download PDFInfo
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- CN211180372U CN211180372U CN202020136728.8U CN202020136728U CN211180372U CN 211180372 U CN211180372 U CN 211180372U CN 202020136728 U CN202020136728 U CN 202020136728U CN 211180372 U CN211180372 U CN 211180372U
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Abstract
The utility model relates to a camera lens technical field. The utility model discloses an optical imaging lens, which comprises twelve lenses, wherein a first lens is a convex-concave lens with positive refractive index; the second and third lenses are convex-concave lenses with negative refractive index; the fourth lens is a concave-convex lens with positive refractive index; the fifth lens is a concave-convex lens with negative refractive index; the sixth, seventh, ninth, tenth and twelfth lenses are convex lenses with positive refractive index; the eighth and eleventh lenses are concave lenses with negative refractive index. The utility model has a large image surface; the resolution ratio is high, and the imaging quality is good; the high and low temperature coke loss is small or no coke loss; the light transmission is large; the total length is short; good confocal property of visible light and infrared light.
Description
Technical Field
The utility model belongs to the technical field of the camera lens, specifically relate to an optical imaging camera lens for intelligent transportation.
Background
With the continuous progress of scientific technology and the continuous development of society, in recent years, optical imaging lenses are also rapidly developed and widely applied to various fields such as smart phones, tablet computers, video conferences, vehicle-mounted monitoring, security monitoring, intelligent traffic systems and the like, so that the requirements on the optical imaging lenses are higher and higher.
In an intelligent traffic system, the performance of an optical imaging lens is critical, and the reliability of the whole system is affected. However, the optical imaging lens applied to the 8mm focal length section of the intelligent traffic system at present has a small image surface; the control on the transfer function is poor, the resolution ratio is low, and the resolving power is low; when the coke is used in high and low temperature environments, the coke loss is serious; the light passing is generally small, the light inlet quantity is low in a low-light environment, and the shot picture is dark; when the method is applied to an infrared band, obvious defocusing can occur; in order to meet the requirements of high resolution, large and complex lens, long total length and incapability of meeting the increasing requirements of intelligent traffic systems, improvement is urgently needed.
Disclosure of Invention
An object of the utility model is to provide an optical imaging lens is used for solving the technical problem that the above-mentioned exists.
In order to achieve the above object, the utility model adopts the following technical scheme: an optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis; the first lens element to the twelfth lens element each include an object-side surface facing the object side and allowing the imaging light to pass therethrough and an image-side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fourth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the fifth lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the seventh lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the eighth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the ninth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the tenth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the eleventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface;
the twelfth lens element with a positive refractive index has a convex object-side surface and a convex image-side surface;
the fourth lens and the fifth lens are mutually cemented, the seventh lens and the eighth lens are mutually cemented, and the tenth lens and the eleventh lens are mutually cemented;
the optical imaging lens has only twelve lenses with refractive indexes.
Further, the optical imaging lens further satisfies the following conditions: vd4 is less than or equal to 20, vd5 is more than or equal to 50, | vd4-vd5| > 35; vd7 is more than or equal to 80, vd8 is less than or equal to 43, | vd7-vd8| > 38; vd10 is more than or equal to 80, vd11 is less than or equal to 25, | vd10-vd11| >50, wherein vd4, vd5, vd7, vd8, vd10 and vd11 are the dispersion coefficients of the fourth lens, the fifth lens, the seventh lens, the eighth lens, the tenth lens and the eleventh lens respectively.
Further, the temperature coefficients of refractive indexes of the sixth lens, the seventh lens and the tenth lens are negative values.
Further, the optical imaging lens further satisfies the following conditions: nd12 is more than or equal to 1.9, vd12 is less than 21, nd12 and vd12 are respectively the refractive index and the abbe number of the twelfth lens, and the relative partial dispersion of the twelfth lens is more than 0.63.
Further, the optical imaging lens further satisfies the following conditions: vd4<20, wherein vd4 is the abbe number of the fourth lens respectively, and the relative partial dispersion of the fourth lens is greater than 0.63.
Further, the optical imaging lens further satisfies the following conditions: 1.75< nd2<1.85, 45< vd2< 50; 1.85< nd3<2.05,32< vd3< 37; 1.9< nd4<2.05, 15< vd4< 20; 1.6< nd5<1.8,50< vd5< 60; 1.55< nd6<1.7,58< vd6< 70; 1.48< nd7<1.65,70< vd7< 83; 1.48< nd10<1.65,70< vd10< 83; 1.85< nd12<2.05,15< vd12<20, where nd2, nd3, nd4, nd5, nd6, nd7, nd10 and nd12 are refractive indices of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the tenth lens and the twelfth lens, respectively, and vd2, vd3, vd4, vd5, vd6, vd7, vd10 and vd12 are abbe coefficients of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the tenth lens and the twelfth lens, respectively.
Further, the optical imaging lens further satisfies the following conditions: nd2 is more than 1.8, and D22/R22 is less than or equal to 1.9, wherein nd2 is the refractive index of the second lens, D22 is the clear aperture of the image side surface of the second lens, and R22 is the curvature radius of the image side surface of the second lens.
Further, the optical imaging lens further satisfies the following conditions: 0.37< | R11/R12| <0.42, where R11 and R12 are the radii of curvature of the object-side and image-side surfaces of the first lens, respectively.
Further, the optical imaging lens further satisfies the following conditions: 0.9< | R22/R32| < 1.1; 0.55< | R71/R91| < 0.7; 1.35< | R101/R121| < 1.45; 0.75< | R112/R122| <0.95, where R22 is a radius of curvature of the image-side surface of the second lens, R32 is a radius of curvature of the image-side surface of the third lens, R71 is a radius of curvature of the object-side surface of the seventh lens, R91 is a radius of curvature of the object-side surface of the ninth lens, R101 is a radius of curvature of the object-side surface of the tenth lens, R121 is a radius of curvature of the object-side surface of the twelfth lens, R112 is a radius of curvature of the image-side surface of the eleventh lens, and R122 is a radius of curvature of the image-side surface of the twelfth lens.
Further, the optical imaging lens further satisfies that 1.2< TT L1/TT L2 <1.3, wherein TT L1 is the distance on the optical axis from the object side surface of the first lens to the image side surface of the fifth lens, and TT L2 is the distance on the optical axis from the object side surface of the fifth lens to the image side surface of the twelfth lens.
The utility model has the advantages of:
the utility model adopts twelve lenses, and through the arrangement design of the refractive index and the surface type of each lens, the lens has a large image surface and can support a sensor of 1/1 inches; the resolution is high, and 10M-12M pixels can be supported; the whole system is optimized without heating, the focusing is carried out at normal temperature, and the high and low temperature defocusing is small or not defocusing; the light transmission is large, more light input quantity can be obtained, the picture is bright, and the low-light effect is good; the confocal property of visible light and infrared light is good; the total length is shorter.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is a graph of MTF of 0.435-0.650 μm at room temperature (20 ℃ C.) according to an embodiment of the present invention;
FIG. 3 is a graph of MTF at 0.435-0.650 μm at a high temperature (70 ℃ C.) according to an embodiment of the present invention;
FIG. 4 is a graph of MTF of 0.435-0.650 μm at low temperature (-30 ℃ C.) according to an embodiment of the present invention;
fig. 5 is a defocus graph of 0.435-0.650 μm visible light according to the first embodiment of the present invention;
fig. 6 is a defocus graph of 0.850 μm infrared in the first embodiment of the present invention;
fig. 7 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 8 is a graph of MTF of 0.435-0.650 μm at room temperature (20 ℃ C.) according to example II of the present invention;
FIG. 9 is a graph of MTF of 0.435-0.650 μm at high temperature (70 ℃ C.) according to example II of the present invention;
FIG. 10 is a graph of MTF of 0.435-0.650 μm at low temperature (-30 ℃ C.) according to example II of the present invention;
fig. 11 is a defocus graph of 0.435-0.650 μm visible light according to the second embodiment of the present invention;
fig. 12 is a defocus graph of 0.850 μm infrared in the second embodiment of the present invention;
fig. 13 is a schematic structural view of a third embodiment of the present invention;
FIG. 14 is a graph of MTF of 0.435-0.650 μm at three temperatures (20 ℃ C.) according to an embodiment of the present invention;
FIG. 15 is a graph of MTF of 0.435-0.650 μm at three high temperatures (70 ℃ C.) in accordance with an embodiment of the present invention;
FIG. 16 is a graph of MTF of 0.435-0.650 μm at low temperature (-30 ℃ C.) according to example III of the present invention;
fig. 17 is a defocus graph of 0.435-0.650 μm visible light according to the third embodiment of the present invention;
fig. 18 is a defocus graph of 0.850 μm infrared in the third embodiment of the present invention;
fig. 19 is a schematic structural diagram of a fourth embodiment of the present invention;
FIG. 20 is a graph of MTF of 0.435-0.650 μm at four normal temperatures (20 ℃ C.) in accordance with an embodiment of the present invention;
FIG. 21 is a graph of MTF of 0.435-0.650 μm at four high temperatures (70 ℃ C.) in accordance with an embodiment of the present invention;
FIG. 22 is a graph of MTF of 0.435-0.650 μm at low temperature (-30 ℃ C.) according to example four of the present invention;
fig. 23 is a defocus graph of 0.435-0.650 μm visible light according to the fourth embodiment of the present invention;
fig. 24 is a defocus graph of 0.850 μm infrared in the fourth embodiment of the present invention;
fig. 25 is a table of values of relevant important parameters according to four embodiments of the present invention.
Detailed Description
To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The present invention will now be further described with reference to the accompanying drawings and detailed description.
As used herein, the term "a lens element having a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens data sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
The utility model provides an optical imaging lens, which comprises a first lens to a twelfth lens from an object side to an image side along an optical axis in sequence; the first lens element to the twelfth lens element each include an object-side surface facing the object side and passing the image light and an image-side surface facing the image side and passing the image light.
The first lens element with positive refractive index has a convex object-side surface and a concave image-side surface.
The second lens element with negative refractive index has a convex object-side surface and a concave image-side surface.
The third lens element with negative refractive index has a convex object-side surface and a concave image-side surface.
The fourth lens element with positive refractive power has a concave object-side surface and a convex image-side surface.
The fifth lens element with negative refractive index has a concave object-side surface and a convex image-side surface.
The sixth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The seventh lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The eighth lens element with negative refractive index has a concave object-side surface and a concave image-side surface.
The ninth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The tenth lens element with a positive refractive power has a convex object-side surface and a convex image-side surface.
The eleventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface.
The twelfth lens element with a positive refractive index has a convex object-side surface and a convex image-side surface.
The fourth lens element is cemented with the fifth lens element, the seventh lens element is cemented with the eighth lens element, the tenth lens element is cemented with the eleventh lens element, and the optical imaging lens assembly has only the twelve lens elements.
The utility model adopts twelve lenses, and through the arrangement design of the refractive index and the surface type of each lens, the lens has a large image surface and can support a sensor of 1/1 inches; the resolution is high, and 10M-12M pixels can be supported; the whole system is optimized without heating, the focusing is carried out at normal temperature, and the high and low temperature defocusing is small or not defocusing; the light transmission is large, more light input quantity can be obtained, the picture is bright, and the low-light effect is good; the confocal property of visible light and infrared light is good; the total length is shorter.
Preferably, the optical imaging lens further satisfies: vd4 is less than or equal to 20, vd5 is more than or equal to 50, | vd4-vd5| > 35; vd7 is more than or equal to 80, vd8 is less than or equal to 43, | vd7-vd8| > 38; vd10 is more than or equal to 80, vd11 is less than or equal to 25, | vd10-vd11| >50, wherein vd4, vd5, vd7, vd8, vd10 and vd11 are respectively the dispersion coefficients of the fourth lens, the fifth lens, the seventh lens, the eighth lens, the tenth lens and the eleventh lens, further achromatization is carried out, the visible and infrared confocal performance and the image quality are optimized, and the optical performance of the system is improved.
Preferably, the temperature coefficients of refractive index of the sixth lens, the seventh lens and the tenth lens are negative values to balance temperature drift.
Preferably, the optical imaging lens further satisfies: nd12 is more than or equal to 1.9, vd12 is less than 21, nd12 and vd12 are respectively the refractive index and the abbe number of the twelfth lens, and the relative partial dispersion of the twelfth lens is more than 0.63, so that chromatic aberration is further effectively eliminated.
Preferably, the optical imaging lens further satisfies: vd4<20, wherein vd4 is the abbe number of the fourth lens respectively, and the relative partial dispersion of the fourth lens is larger than 0.63, further effectively eliminating chromatic aberration.
Preferably, the optical imaging lens further satisfies: 1.75< nd2<1.85, 45< vd2< 50; 1.85< nd3<2.05,32< vd3< 37; 1.9< nd4<2.05, 15< vd4< 20; 1.6< nd5<1.8,50< vd5< 60; 1.55< nd6<1.7,58< vd6< 70; 1.48< nd7<1.65,70< vd7< 83; 1.48< nd10<1.65,70< vd10< 83; 1.85< nd12<2.05,15< vd12<20, wherein nd2, nd3, nd4, nd5, nd6, nd7, nd10 and nd12 are refractive indexes of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the tenth lens and the twelfth lens respectively, and vd2, vd3, vd4, vd5, vd6, vd7, vd10 and vd12 are dispersion coefficients of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the tenth lens and the twelfth lens respectively, so that good confocal performance between visible light and infrared light can be realized, and system performance is optimized.
Preferably, the optical imaging lens further satisfies: nd2 is more than 1.8, D22/R22 is less than or equal to 1.9, wherein nd2 is the refractive index of the second lens, D22 is the clear aperture of the image side surface of the second lens, and R22 is the curvature radius of the image side surface of the second lens, so that the processing is convenient, and the yield is improved.
Preferably, the optical imaging lens further satisfies: 0.37< | R11/R12| <0.42, wherein R11 and R12 are the curvature radii of the object side surface and the image side surface of the first lens respectively, and the optical performance of the system is further improved.
Preferably, the optical imaging lens further satisfies: 0.9< | R22/R32| < 1.1; 0.55< | R71/R91| < 0.7; 1.35< | R101/R121| <1.45, 0.75< | R112/R122| <0.95, wherein R22 is a radius of curvature of the image-side surface of the second lens, R32 is a radius of curvature of the image-side surface of the third lens, R71 is a radius of curvature of the object-side surface of the seventh lens, R91 is a radius of curvature of the object-side surface of the ninth lens, R101 is a radius of curvature of the object-side surface of the tenth lens, R121 is a radius of curvature of the object-side surface of the twelfth lens, R112 is a radius of curvature of the image-side surface of the eleventh lens, and R122 is a radius of curvature of the image-side surface of the twelfth lens, further improving system optical performance.
Preferably, the optical imaging lens further satisfies that 1.2< TT L1/TT L2 <1.3, wherein TT L1 is the distance on the optical axis from the object side surface of the first lens to the image side surface of the fifth lens, and TT L2 is the distance on the optical axis from the object side surface of the fifth lens to the image side surface of the twelfth lens, and the total length of the optical imaging lens is further controlled.
Preferably, the lens further comprises a diaphragm, and the diaphragm is arranged between the fifth lens and the sixth lens, so that the process sensitivity is reduced, and the assembly yield is improved.
The optical imaging lens of the present invention will be described in detail with reference to specific embodiments.
Example one
As shown in fig. 1, an optical imaging lens includes, in order along an optical axis I, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a stop 130, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 100, an eleventh lens 110, a twelfth lens 120, a protective glass 140, and an image plane 150 from an object side a1 to an image side a2, where each of the first lens 1 to the twelfth lens 120 includes an object side surface facing the object side a1 and passing an imaging light ray and an image side surface facing the image side a2 and passing an imaging light ray.
The first lens element 1 has a positive refractive index, the object-side surface 11 of the first lens element 1 is convex, and the image-side surface 12 of the first lens element 1 is concave.
The second lens element 2 has a negative refractive index, and an object-side surface 21 of the second lens element 2 is convex and an image-side surface 22 of the second lens element 2 is concave.
The third lens element 3 has a negative refractive index, and an object-side surface 31 of the third lens element 3 is convex and an image-side surface 32 of the third lens element 3 is concave.
The fourth lens element 4 has a positive refractive index, the object-side surface 41 of the fourth lens element 4 is concave, and the image-side surface 42 of the fourth lens element 4 is convex.
The fifth lens element 5 has a negative refractive index, and an object-side surface 51 of the fifth lens element 5 is concave and an image-side surface 52 of the fifth lens element 5 is convex.
The sixth lens element 6 has a positive refractive index, the object-side surface 61 of the sixth lens element 6 is convex, and the image-side surface 62 of the sixth lens element 6 is convex.
The seventh lens element 7 has a positive refractive index, and an object-side surface 71 of the seventh lens element 7 is convex and an image-side surface 72 of the seventh lens element 7 is convex.
The eighth lens element 8 has a negative refractive index, and an object-side surface 81 of the eighth lens element 8 is concave and an image-side surface 82 of the eighth lens element 8 is concave.
The ninth lens element 9 with positive refractive power has a convex object-side surface 91 of the ninth lens element 9 and a convex image-side surface 92 of the ninth lens element 9.
The tenth lens element 100 with positive refractive power has a convex object-side surface 101 of the tenth lens element 100 and a convex image-side surface 102 of the tenth lens element 100.
The eleventh lens element 110 has a negative refractive index, and an object-side surface 111 of the eleventh lens element 110 is concave and an image-side surface 112 of the eleventh lens element 110 is concave.
The twelfth lens element 120 with a positive refractive index has a convex object-side surface 121 of the twelfth lens element 120 and a convex image-side surface 122 of the twelfth lens element 120.
The image-side surface 42 of the fourth lens element 4 is cemented to the object-side surface 51 of the fifth lens element 5, the image-side surface 72 of the seventh lens element 7 is cemented to the object-side surface 81 of the eighth lens element 8, and the image-side surface 102 of the tenth lens element 100 is cemented to the object-side surface 111 of the eleventh lens element 110.
In this embodiment, the temperature coefficient of refractive index dn/dt of the sixth lens 6, the seventh lens 7, and the tenth lens 100 is negative, and the relative partial dispersion of the fourth lens 4 and the twelfth lens 120 is greater than 0.63.
Of course, in some embodiments, the stop 130 may also be disposed between other lenses.
The detailed optical data of this embodiment are shown in Table 1-1.
Table 1-1 detailed optical data for example one
Please refer to fig. 25 for values of the conditional expressions according to this embodiment.
Referring to fig. 2-4, it can be seen that the resolution of the present embodiment is good for the control of the transfer function, the resolution is high, which can reach 140lp/mm >0.2, can support 10M-12M pixels, and hardly causes defocus at high and low temperatures; as shown in fig. 5 and 6, the confocal performance of visible light and infrared light is good, and the defocus amount at the time of switching between visible light and infrared light is less than 10 μm.
In this embodiment, the focal length f of the optical imaging lens is 8.4mm, the aperture value FNO is 1.4, the image plane diameter Φ is 17.6mm, the distance TT L between the object-side surface 11 of the first lens 1 and the imaging plane 150 on the optical axis I is 96.9mm, and the field angle FOV is 94.7 °.
Example two
As shown in fig. 7, in this embodiment, the surface convexoconcave and the refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment is shown in Table 2-1.
TABLE 2-1 detailed optical data for example two
| Surface of | Caliber/mm | Radius of curvature/mm | Thickness/mm | Material of | Refractive index | Coefficient of dispersion | Focal length/mm | ||
| - | Shot object surface | - | | Infinity | |||||
| 11 | First lens | 60.54 | 42.059 | 12.65 | Glass | 1.64 | 60.21 | 100.70 | |
| 12 | 53.64 | 106.028 | 0.10 | ||||||
| 21 | Second lens | 32.09 | 24.351 | 2.35 | Glass | 1.80 | 46.59 | -26.87 | |
| 22 | 20.55 | 10.984 | 6.84 | ||||||
| 31 | Third lens | 19.87 | 91.578 | 1.23 | Glass | 1.91 | 35.26 | -13.68 | |
| 32 | 15.64 | 10.959 | 3.73 | ||||||
| 41 | Fourth lens | 15.65 | -194.285 | 7.88 | Glass | 1.95 | 17.94 | 26.76 | |
| 42 | 14.98 | -23.105 | 0 | ||||||
| 51 | Fifth lens element | 14.98 | -23.105 | 10.84 | Glass | 1.73 | 54.67 | -58.40 | |
| 52 | 13.40 | -60.214 | 1.95 | ||||||
| 130 | Diaphragm | 13.03 | Infinity | 1.40 | |||||
| 61 | Sixth lens element | 13.56 | 123.876 | 7.67 | Glass | 1.60 | 65.46 | 25.68 | |
| 62 | 14.53 | -17.356 | 0.08 | ||||||
| 71 | Seventh lens element | 14.26 | 21.683 | 5.56 | Glass | 1.50 | 81.59 | 15.36 | |
| 72 | 13.83 | -10.831 | 0 | ||||||
| 81 | Eighth lens element | 13.83 | -10.831 | 5.38 | Glass | 1.81 | 40.95 | -8.48 | |
| 82 | 14.73 | 23.029 | 2.33 | ||||||
| 91 | Ninth lens | 16.47 | 35.605 | 4.94 | Glass | 1.74 | 44.90 | 15.12 | |
| 92 | 16.80 | -15.593 | 0.09 | ||||||
| 101 | Tenth lens | 15.52 | 28.971 | 4.52 | Glass | 1.50 | 81.59 | 19.13 | |
| 102 | 15.52 | -13.474 | 0 | ||||||
| 111 | Eleventh lens | 15.52 | -13.474 | 0.99 | Glass | 1.85 | 23.79 | -8.88 | |
| 112 | 16.05 | 17.993 | 1.27 | ||||||
| 121 | Twelfth lens element | 18.26 | 21.006 | 3.54 | Glass | 1.95 | 17.94 | 18.69 | |
| 122 | 19.12 | -111.540 | 10.45 | ||||||
| 140 | Cover glass | 17.67 | Infinity | 0.60 | Glass | 1.52 | 64.21 | Infinity | |
| - | 17.65 | Infinity | 0.64 | ||||||
| 150 | Image plane | 17.62 | Infinity |
Please refer to fig. 25 for values of the conditional expressions according to this embodiment.
Referring to fig. 8-10, it can be seen that the resolution of the present embodiment is good for the control of the transfer function, the resolution is high, which can reach 140lp/mm >0.2, can support 10M-12M pixels, and hardly causes defocus at high and low temperatures; as shown in fig. 11 and 12, the confocal performance of visible light and infrared light is good, and the defocus amount at the time of switching between visible light and infrared light is less than 10 μm.
In this embodiment, the focal length f of the optical imaging lens is 8.4mm, the aperture value FNO is 1.4, the image plane diameter Φ is 17.6mm, the distance TT L between the object-side surface 11 of the first lens 1 and the imaging plane 150 on the optical axis I is 97.0mm, and the field angle FOV is 94.7 °.
EXAMPLE III
As shown in fig. 13, the lens elements of this embodiment have the same surface irregularities and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens element and the lens element thickness are different.
The detailed optical data of this embodiment is shown in Table 3-1.
TABLE 3-1 detailed optical data for EXAMPLE III
| Surface of | Caliber/mm | Radius of curvature/mm | Thickness/mm | Material of | Refractive index | Coefficient of dispersion | Focal length/mm | ||
| - | Shot object surface | - | | Infinity | |||||
| 11 | First lens | 62.04 | 42.311 | 12.19 | Glass | 1.62 | 63.88 | 104.34 | |
| 12 | 56.96 | 111.734 | 1.15 | ||||||
| 21 | Second lens | 31.90 | 24.345 | 2.34 | Glass | 1.80 | 46.59 | -27.03 | |
| 22 | 20.39 | 10.894 | 6.76 | ||||||
| 31 | Third lens | 19.78 | 88.740 | 1.09 | Glass | 1.91 | 35.26 | -14.13 | |
| 32 | 15.69 | 10.961 | 3.73 | ||||||
| 41 | Fourth lens | 15.65 | -191.083 | 7.75 | Glass | 1.95 | 17.94 | 28.08 | |
| 42 | 15.00 | -22.989 | 0 | ||||||
| 51 | Fifth lens element | 15.00 | -22.989 | 10.87 | Glass | 1.73 | 54.67 | -59.30 | |
| 52 | 13.42 | -59.841 | 1.98 | ||||||
| 130 | Diaphragm | 13.05 | Infinity | 1.40 | |||||
| 61 | Sixth lens element | 13.59 | 116.144 | 7.61 | Glass | 1.60 | 65.46 | 26.01 | |
| 62 | 14.54 | -17.428 | 0.13 | ||||||
| 71 | Seventh lens element | 14.28 | 21.566 | 5.53 | Glass | 1.50 | 81.59 | 15.51 | |
| 72 | 13.88 | -10.809 | 0 | ||||||
| 81 | Eighth lens element | 13.88 | -10.809 | 5.14 | Glass | 1.81 | 40.95 | -8.71 | |
| 82 | 14.76 | 22.956 | 2.38 | ||||||
| 91 | Ninth lens | 16.52 | 35.878 | 4.93 | Glass | 1.74 | 44.90 | 15.48 | |
| 92 | 16.80 | -15.566 | 0.09 | ||||||
| 101 | Tenth lens | 15.52 | 28.712 | 4.54 | Glass | 1.50 | 81.59 | 19.33 | |
| 102 | 15.51 | -13.474 | 0 | ||||||
| 111 | Eleventh lens | 15.51 | -13.474 | 0.99 | Glass | 1.85 | 23.79 | -9.23 | |
| 112 | 15.95 | 17.885 | 1.25 | ||||||
| 121 | Twelfth lens element | 18.26 | 20.975 | 3.49 | Glass | 1.95 | 17.94 | 19.65 | |
| 122 | 17.92 | -112.137 | 10.53 | ||||||
| 140 | Cover glass | 17.66 | Infinity | 0.60 | Glass | 1.52 | 64.21 | Infinity | |
| - | 17.66 | Infinity | 0.56 | ||||||
| 150 | Image plane | 17.64 | Infinity |
Please refer to fig. 25 for values of the conditional expressions according to this embodiment.
Referring to fig. 14-16, it can be seen that the resolution of the present embodiment is good for the control of the transfer function, the resolution is high, which can reach 140lp/mm >0.2, can support 10M-12M pixels, and hardly causes defocus at high and low temperatures; as shown in fig. 17 and 18, the confocal performance of visible light and infrared light is good, and the defocus amount at the time of switching between visible light and infrared light is less than 10 μm.
In this embodiment, the focal length f of the optical imaging lens is 8.4mm, the aperture value FNO is 1.4, the image plane diameter Φ is 17.6mm, the distance TT L between the object-side surface 11 of the first lens 1 and the imaging plane 150 on the optical axis I is 97.0mm, and the field angle FOV is 94.7 °.
Example four
As shown in fig. 19, in this embodiment, the surface convexoconcave and the refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment is shown in Table 4-1.
TABLE 4-1 detailed optical data for example four
| Surface of | Caliber/mm | Radius of curvature/mm | Thickness/mm | Material of | Refractive index | Coefficient of dispersion | Focal length/mm | ||
| - | Shot object surface | - | | Infinity | |||||
| 11 | First lens | 59.89 | 40.750 | 12.93 | Glass | 1.64 | 60.21 | 98.36 | |
| 12 | 52.66 | 100.472 | 0.10 | ||||||
| 21 | Second lens | 31.55 | 23.824 | 1.87 | Glass | 1.80 | 46.59 | -26.07 | |
| 22 | 20.45 | 10.788 | 7.10 | ||||||
| 31 | Third lens | 19.79 | 91.990 | 1.29 | Glass | 1.95 | 32.32 | -13.63 | |
| 32 | 15.78 | 11.381 | 3.60 | ||||||
| 41 | Fourth lens | 15.65 | -246.062 | 7.16 | Glass | 1.95 | 17.94 | 24.59 | |
| 42 | 15.25 | -21.811 | 0 | ||||||
| 51 | Fifth lens element | 15.25 | -21.811 | 11.44 | Glass | 1.73 | 54.67 | -49.75 | |
| 52 | 13.54 | -66.385 | 2.26 | ||||||
| 130 | Diaphragm | 13.17 | Infinity | 1.36 | |||||
| 61 | Sixth lens element | 13.71 | 126.869 | 7.82 | Glass | 1.62 | 63.41 | 25.76 | |
| 62 | 14.74 | -17.852 | 0.08 | ||||||
| 71 | Seventh lens element | 14.45 | 21.302 | 5.75 | Glass | 1.50 | 81.59 | 15.42 | |
| 72 | 13.99 | -10.946 | 0 | ||||||
| 81 | Eighth lens element | 13.99 | -10.946 | 5.03 | Glass | 1.81 | 40.95 | -8.64 | |
| 82 | 14.83 | 23.496 | 2.29 | ||||||
| 91 | Ninth lens | 16.51 | 35.369 | 4.71 | Glass | 1.74 | 44.90 | 15.13 | |
| 92 | 16.80 | -15.688 | 0.09 | ||||||
| 101 | Tenth lens | 15.52 | 29.628 | 4.45 | Glass | 1.50 | 81.59 | 19.24 | |
| 102 | 15.20 | -13.474 | 0 | ||||||
| 111 | Eleventh lens | 15.20 | -13.474 | 0.99 | Glass | 1.85 | 23.79 | -8.78 | |
| 112 | 15.70 | 17.511 | 1.19 | ||||||
| 121 | Twelfth lens element | 18.26 | 20.582 | 3.64 | Glass | 1.95 | 17.94 | 18.66 | |
| 122 | 18.63 | -124.356 | 8.50 | ||||||
| 140 | Cover glass | 17.81 | Infinity | 0.60 | Glass | 1.52 | 64.21 | Infinity | |
| - | 17.77 | Infinity | 2.74 | ||||||
| 150 | Image plane | 17.62 | Infinity |
Please refer to fig. 25 for values of the conditional expressions according to this embodiment.
The resolution of the present embodiment is shown in fig. 20-22, which shows that the image has good control of the transfer function, high resolution, which can reach 140lp/mm >0.2, can support 10M-12M pixels, and hardly causes defocus at high and low temperatures; as shown in fig. 23 and 24, the confocal performance of visible light and infrared light is good, and the defocus amount at the time of switching between visible light and infrared light is less than 10 μm.
In this embodiment, the focal length f of the optical imaging lens is 8.4mm, the aperture value FNO is 1.4, the image plane diameter Φ is 17.6mm, the distance TT L between the object-side surface 11 of the first lens 1 and the imaging plane 150 on the optical axis I is 97.0mm, and the field angle FOV is 94.7 °.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An optical imaging lens characterized in that: the optical lens assembly sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side along an optical axis; the first lens element to the twelfth lens element each include an object-side surface facing the object side and allowing the imaging light to pass therethrough and an image-side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fourth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the fifth lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the seventh lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the eighth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the ninth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the tenth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the eleventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface;
the twelfth lens element with a positive refractive index has a convex object-side surface and a convex image-side surface;
the fourth lens and the fifth lens are mutually cemented, the seventh lens and the eighth lens are mutually cemented, and the tenth lens and the eleventh lens are mutually cemented;
the optical imaging lens has only twelve lenses with refractive indexes.
2. The optical imaging lens of claim 1, further satisfying: vd4 is less than or equal to 20, vd5 is more than or equal to 50, | vd4-vd5| > 35; vd7 is more than or equal to 80, vd8 is less than or equal to 43, | vd7-vd8| > 38; vd10 is more than or equal to 80, vd11 is less than or equal to 25, | vd10-vd11| >50, wherein vd4, vd5, vd7, vd8, vd10 and vd11 are the dispersion coefficients of the fourth lens, the fifth lens, the seventh lens, the eighth lens, the tenth lens and the eleventh lens respectively.
3. The optical imaging lens according to claim 1, characterized in that: the temperature coefficients of refractive indexes of the sixth lens, the seventh lens and the tenth lens are negative values.
4. The optical imaging lens of claim 1, further satisfying: nd12 is more than or equal to 1.9, vd12 is less than 21, nd12 and vd12 are respectively the refractive index and the abbe number of the twelfth lens, and the relative partial dispersion of the twelfth lens is more than 0.63.
5. The optical imaging lens of claim 1, further satisfying: vd4<20, wherein vd4 is the abbe number of the fourth lens respectively, and the relative partial dispersion of the fourth lens is greater than 0.63.
6. The optical imaging lens of claim 1, further satisfying: 1.75< nd2<1.85, 45< vd2< 50; 1.85< nd3<2.05,32< vd3< 37; 1.9< nd4<2.05, 15< vd4< 20; 1.6< nd5<1.8,50< vd5< 60; 1.55< nd6<1.7,58< vd6< 70; 1.48< nd7<1.65,70< vd7< 83; 1.48< nd10<1.65,70< vd10< 83; 1.85< nd12<2.05,15< vd12<20, where nd2, nd3, nd4, nd5, nd6, nd7, nd10 and nd12 are refractive indices of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the tenth lens and the twelfth lens, respectively, and vd2, vd3, vd4, vd5, vd6, vd7, vd10 and vd12 are abbe coefficients of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the tenth lens and the twelfth lens, respectively.
7. The optical imaging lens of claim 1, further satisfying: nd2 is more than 1.8, and D22/R22 is less than or equal to 1.9, wherein nd2 is the refractive index of the second lens, D22 is the clear aperture of the image side surface of the second lens, and R22 is the curvature radius of the image side surface of the second lens.
8. The optical imaging lens of claim 1, further satisfying: 0.37< | R11/R12| <0.42, where R11 and R12 are the radii of curvature of the object-side and image-side surfaces of the first lens, respectively.
9. The optical imaging lens of claim 1, further satisfying: 0.9< | R22/R32| < 1.1; 0.55< | R71/R91| < 0.7; 1.35< | R101/R121| < 1.45; 0.75< | R112/R122| <0.95, where R22 is a radius of curvature of the image-side surface of the second lens, R32 is a radius of curvature of the image-side surface of the third lens, R71 is a radius of curvature of the object-side surface of the seventh lens, R91 is a radius of curvature of the object-side surface of the ninth lens, R101 is a radius of curvature of the object-side surface of the tenth lens, R121 is a radius of curvature of the object-side surface of the twelfth lens, R112 is a radius of curvature of the image-side surface of the eleventh lens, and R122 is a radius of curvature of the image-side surface of the twelfth lens.
10. The optical imaging lens of claim 1, further comprising 1.2< TT L1/TT L2 <1.3, wherein TT L1 is the distance on the optical axis from the object side surface of the first lens element to the image side surface of the fifth lens element, and TT L2 is the distance on the optical axis from the object side surface of the fifth lens element to the image side surface of the twelfth lens element.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111123483A (en) * | 2020-01-21 | 2020-05-08 | 厦门力鼎光电股份有限公司 | Optical imaging lens |
| CN113311574A (en) * | 2021-05-08 | 2021-08-27 | 江苏大学 | Infrared and visible light dual-purpose vehicle-mounted large-view-field lens and correction method thereof |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111123483A (en) * | 2020-01-21 | 2020-05-08 | 厦门力鼎光电股份有限公司 | Optical imaging lens |
| CN113311574A (en) * | 2021-05-08 | 2021-08-27 | 江苏大学 | Infrared and visible light dual-purpose vehicle-mounted large-view-field lens and correction method thereof |
| CN113311574B (en) * | 2021-05-08 | 2022-08-23 | 江苏大学 | Infrared and visible light dual-purpose vehicle-mounted large-view-field lens and correction method thereof |
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